There are 30 students in Mr. Ryan's Algebra class. On the first test, 8 students scored 95%, 10 students scored 80% and 12 students scored 75%. What was the overall average on the test?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.

Q1 how many whole numbers less than 1000 can be written as a product of 3 consecutive whole numbers? a)10 b)11 c)15 d)21 q2 how many whole numbers between 5000 and 6000 consist of four different digits that decrease from left to right? a)3 b)10 c)69 d)120